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Flora of South Australia (Ed Photograph: Helen Owens © Department of Environment, Water and Natural Resources, Government of South Australia Department of All rights reserved Environment, Copyright of illustrations might reside with other institutions or Water and individuals. Please enquire for details. Natural Resources Contact: Dr Jürgen Kellermann Editor, Flora of South Australia (ed. 5) State Herbarium of South Australia PO Box 2732 Kent Town SA 5071 Australia email: [email protected] Flora of South Australia 5th Edition | Edited by Jürgen Kellermann COMMELINACEAE1 J.P. Jessop2 & J.G. Conran3 Erect or creeping herbs; leaves parallel-veined, with sheathing bases. Flowers usually small, bisexual, terminal or axillary, in 1–many-flowered, 1-sided cymose cincinni, often clustered or in panicles; sepals 3, free or fused, imbricate; petals 3, free or fused, coloured, some occasionally reduced; stamens 6, but some often reduced to staminodes or absent, the perfect or fertile ones having usually 2-celled anthers opening in slits; ovary superior, 2- or 3-celled; ovules orthotropous, attached to the axile placentas; style simple. Fruit a capsule, seeds 1–many. Spiderwort or dayflower family. About 40 genera and about 650 species worldwide, mainly in warm areas. At least 11 genera and c. 47 species in Australia, with three genera and four species recorded in South Australia. 1. Inflorescence an open panicle with well developed scape........................................................................ 2. Murdannia 1: Inflorescence lacking a scape; flowers enclosed in sheathing leaves or bracts 2. Fertile stamens 6; staminodes absent .................................................................................................. 3. Tradescantia 2: Fertile stamens 3; staminodes 3 .............................................................................................................. 1. Commelina 1. COMMELINA L. Sp. Pl. 1: 40 (1753). (After Jan Commelin, 1629–92, and Casper Commelin, 1667–1731, Dutch botanists.) Prepared by J.P. Jessop & J.G. Conran Annual or perennial evergreen or geophytic herbs, erect or prostrate, with a short to elongated rhizome and sometimes thickened roots; leaves cauline or radical. Flowers few, on 1 or 2 peduncles enclosed in a rather large spathe; sepals and petals free, delicate; fertile stamens 3, 1 longer than the other 2; staminodes 3, or sometimes 2, in the back part of the flower, smaller, the barren anthers appearing like 4 small spreading valves; style with a small capitate stigma. Capsule 2- or 3-celled, loculicidal. Day-flower; scurvy grass. About 170 species worldwide, mainly in warm areas; c. nine native and two naturalised species in Australia, one native species in South Australia 1. Commelina ensifolia R.Br., Prodr. 269 (1810). — C. undulata R.Br., Prodr. 270 (1810). Glabrous plant, 30–50 cm high; stems rather stiff, branching, leafy; leaves distant, flat or channelled, broadly linear or linear-lanceolate, often undulate on the margin, 5–12 cm × 4–10 mm, with loose scarious striate sheaths 10–15 mm long, spathes spreading, ovate-acute, solitary, on a stipe 5–15 mm long rising from the upper leaf 1 This work can be cited as: Jessop, J.P. & Conran, J.G. (2013). Commelinaceae (version 2). In: Kellermann, J. (ed.), Flora of South Australia (ed. 5). 5 pp. (State Herbarium of South Australia: Adelaide). www.flora.sa.gov.au/ed5 2 State Herbarium of South Australia, PO Box 2732, Kent Town, SA 5087, Australia. 3 Australian Centre for Evolutionary Biology & Biodiversity, Benham Building DX 650 312, School of Earth & Environmental Science, The University of Adelaide, SA 5005, Australia. © Department of Environment, Water and Natural Resources, Government of South Australia. ISBN 978-1-922027-33-7 (PDF). Publication date: 20 June 2013. 1 COMMELINACEAE | Flora of South Australia, 5th Edition sheaths and opposite the leaf, 15–20 mm long and rather broader when spread open, the margins united near the base, thus forming a broad oblique funnel which shelters the flowers, the sides with 4–6 curved nerves meeting at the summit of the straight mid-nerve. Peduncle solitary, stiff, rising from the base of the spathe, about 3-flowered, producing 1 or 2 capsules, the terminal flower usually exserted, the lowest flower male; petals obovate, pale-blue, longer than the sepals, one of the 3 fertile stamens with a long curved anther. Capsule c. 6 mm long, 3-celled, opening in 3 stiff spreading valves, each cell containing 1 smooth oblong seed. Scurvy grass, wandering Jew. The latter common name, although widely used, is based on a pejorative and anti-Semitic legend and should be discouraged. Fig. 1, Pl. 1A–B. S.A.: NW, LE, GT; W.A.; N.T.; Qld; N.S.W. Flowers: probably in all months. A very variable species across its range with hairy and glabrous forms, but there appears to be more or less continuous intergradation between them. This plant is very uncommon in S.A. and the records may represent ephemeral establishments by flood-borne seeds or chance collections at the time the plants were emergent (several other native Commelina species from dry areas of northern Australia are short-term emergent geophytes). The status Fig. 1. Commelina ensifolia. Illustration by G.R.M. Dashorst, from Flora of South Australia 1: 1816, Fig. 826 (1986). of this taxon relative to other apparently closely related and widely distributed species in Africa and India needs further study. The leaves and shoots of most Commelina species (including C. ensifolia) are considered edible and, as one of the common names suggests, have been used a source of fresh greens for vitamin C. Several species are known to cause contact allergy and rashes in people and domestic animals. Grows readily from seed or cuttings, rooting at the stem nodes; drought tolerant and dies down to rootstock under dry conditions. 2. MURDANNIA Royle Ill. Bot. Himal. Mts. 403, pl. 95, f. 3 (1840). (Named after Munshi Murdan Ali, the chief plant collector and Keeper of the Herbarium at the Saharunpore Botanic Garden, India in the early 19th Cent.) J.G. Conran Annual or perennial; stems annual, erect to prostrate; roots often tuberous; leaves cauline or radical, spiral or distichous. Inflorescence a scapose thyrsoid panicle or sessile cincinnus, terminal or terminal and axillary; flowers solitary to numerous, pedicellate or sessile, actinomorphic or slightly zygomorphic, bisexual or rarely unisexual; sepals 3, free, green or coloured; petals 3, free, blue, pink, purple, white or yellow; stamens 3, rarely 2, opposite the sepals, yellow; filaments hairy; staminodes 3 or absent, opposite the petals, yellow; filaments hairy or glabrous; ovary 3-locular; ovules 1–8 per loculus. Fruit a 3–celled capsule; seeds grey to brown, smooth or ornamented. Grass lilies. A genus of c. 50 species native to tropical regions; seven species in Australia with a single native species recorded as possibly naturalised in South Australia. The shoots and leaves of some species are eaten as vegetables in Asia and the roots of some native species were eaten by Australian aborigines. 1. *Murdannia graminea (R.Br.) G.Brückn. in Engl. & Prantl, Nat. Pflanzenfam., ed. 2, 15a: 173 (1930), as gramineum. — Aneilema gramineum R.Br., Prodr. 270 (1810), as graminea. — Illustr.: K.A.Williams, Native Pl. Queensl. 1: 202 (1979); Fl. S.E. Queensl. 3: 78, fig. 12: b1–b2 (1989); Fl. Kimberley Reg. 1021, fig. 306H (1992). 2 COMMELINACEAE | Flora of South Australia, 5th Edition Perennial, erect to c. 80 cm; rhizomatous; stems annual, ± glabrous to densely hairy; roots thick, tuberous; leaves radical and cauline, linear, 5–30 × 0.2–1.5, acute, pubescent to densely glandular-ciliate. Inflorescence an open cymose panicle; scape leafy, bracteate; flowers numerous; pedicels 3–10 mm long; sepals ovate, 5–8 × 2–3.5 mm, persistent; petals broadly obovate, 5–10 × 5–10 mm, blue to pink-purple, rarely white; stamens 3; staminodes 3; filaments 5–6 mm long, white hairy; anthers 1 mm long, ovoid, purplish grey, staminodes c. 0.5 mm diam, x-shaped, pale creamy yellow; ovary c. 0.5 mm diam. green; style 4–5 mm long, lavender-purple. Fruit ovoid- ellipsoid, 5–10 mm long; seeds 4–5 per loculus, grey to brown, 1.5–2.5 mm long, rugose, pitted. Grass lily; blue murdannia. Pl. 1C. S.A.: *?SL; W.A.; N.T.; Qld; N.S.W. Flowers: Dec.–Jul. The plant is a geophyte, dying down to the rootstock during the dry months. A very variable taxon in need of detailed study across its wide range in SE Asia and northern Australia. The tuberous roots of this species were eaten by the aborigines. Easily cultivated and grows and flowers well in Adelaide. 3. TRADESCANTIA L. Sp. Pl. 1: 288 (1753); Gen. Pl., ed. 5, 139 (1754). (Named for John Tradescant (1608–1662), gardener to Charles I of England.) J.G. Conran Rhoeo Hance ex Walp., Ann. Bot. Syst. 3: 659 (1853). Setcreasea K.Schum. & Sydow, Just‘s Bot. Jahresber. (1899) 27(1): 452 (1901). Zebrina Schnizl., Bot. Zeitung (Berlin) 7: 868 (1849). Perennial herbs, erect or prostrate, with a short to elongated rhizome; leaves cauline or radical. Inflorescence axillary or terminal, a cincinnus or compound umbellate cyme subtended by a pair of leafy or boat-shaped bracts; flowers few to numerous, pedicellate, actinomorphic; sepals fused or free, green or coloured; petals free or connate, white or coloured; stamens 6, all fertile, filaments hairy; ovary 3–locular; ovules 2 per loculus. Fruit a dehiscent capsule; seeds single or few, brown to whitish, smooth or sculptured. Spiderworts or inch plants are the preferred common names for members of the genus. The common name ‘wandering Jew’ although frequently applied to procumbent species in this and other genera in the family is based upon an anti-Semitic mediaeval legend, and its use should be discouraged. An American genus of c. 60 species, 4–5 species naturalised in Australia, 2 species in South Australia. Although sometimes separated, the widely cultivated species placed in Rhoeo, Setcreasea and Zebrina have been shown to be members of Tradescantia (Hunt 1975, 1978).
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